Amachinist bores a hole of diameter 1.360 cm in a steel plate that is at 24.2 ∘c. what is the cross-sectional area of the hole when the temperature of the plate is increased to 156∘c? give an answer in cm2 with 3 significant figures. assume that the coefficient of linear expansion remains constant over this temperature range.

Awoman stands a distance d from a loud motor that emits sound uniformly in all directions. the sound intensity at her position is an uncomfortable 2.0×10-3 w/m2. at a distance 2.6 times as far from the motor, what are (a) the sound intensity and (b) the sound intensity level relative to the threshold of hearing?

Which best represents the law of conservation of mass ?

Asolid round steel rod 6.25 mm in diameter and 375 mm long is rigidly bonded to the end of solid square brass rod 25 mm on a side and 300 mm long. the geometric axes of the bare are along the same line. an axial tensile force of 5.4 kn is applied at the extreme ends of the assembly. for steel e = 200 gpa and for brass e = 90 gpa. determine the total elongation for the assembly.